<template>
  <view class="u-wrap">
    <view class="u-search-box">
      <u-search v-model="bkiTypeDictText" :showAction="false" placeholder="搜索" @change="getTableData" />
    </view>
    <view class="u-menu-wrap">
      <scroll-view
        :scroll-into-view="itemId"
        :scroll-top="scrollTop"
        class="u-tab-view menu-scroll-view"
        scroll-with-animation
        scroll-y
      >
        <view
          v-for="(item, index) in tabbar"
          :key="index"
          :class="{ 'u-tab-item-active': current === index }"
          class="u-tab-item"
          @tap.stop="swichMenu(index)"
        >
          <text class="u-line-1">{{ item.bkiType_dictText }}</text>
        </view>
      </scroll-view>
      <scroll-view :scroll-top="scrollRightTop" class="right-box" scroll-with-animation scroll-y @scroll="rightScroll">
        <view class="page-view">
          <view v-for="(item, index) in tabbar" :id="'item' + index" :key="index" class="class-item">
            <view class="item-title">
              <text>{{ item.bkiType_dictText }}</text>
            </view>
            <view class="item-container">
              <MyCard
                v-for="(item1, index1) in item.bookingSiteVos"
                :key="index1"
                class="thumb-box"
                @tap="routerPath(item1.id)"
              >
                <view class="flex items-center">
                  <image :src="getImageUrl(item1.bkiHeadPhoto)" class="item-menu-image" />
                  <view class="ml-1.5">
                    <view class="text-blue-500 font-bold text-xs">
                      {{ item1.bkiSiteName }}
                    </view>
                    <view class="text-gray-500 text-xs mt-1 line-clamp-2">
                      {{ item1.bkiNotice }}
                    </view>
                  </view>
                </view>
                <view class="flex w-full items-center">
                  <view class="text-xs flex-grow whitespace-nowrap">
                    <text class="text-orange-400">
                      {{
                        item1.bkiMinPrice === item1.bkiMaxPrice
                          ? `￥${item1.bkiMinPrice / 100}`
                          : `￥${item1.bkiMinPrice / 100}~${item1.bkiMaxPrice / 100}`
                      }}
                    </text>
                  </view>
                  <u-button shape="circle" size="small" text="立即预定" type="primary" />
                </view>
              </MyCard>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>
<script lang="ts" setup>
import { getCurrentInstance, inject, Ref } from 'vue';
import MyCard from '@/components/MyCard/MyCard.vue';
import { RequestInterface } from '@/typings/request';
import { SUBSCRIBE } from '@/api/subscribe';
import NodeInfo = UniNamespace.NodeInfo;

const $http: RequestInterface = inject('$http') as RequestInterface;
const oldScrollTop = ref(0);
const current = ref(0); // 预设当前项的值
const menuHeight = ref(0); // 左边菜单的高度
const menuItemHeight = ref(0); // 左边菜单item的高度
const itemId = ref<string>(''); // 栏目右边scroll-view用于滚动的id
const tabbar = ref([]);
const arr = ref([]);
const timer = ref(null);

const instance = getCurrentInstance(); // 获取组件实例

const index = ref(0);

onLoad((query) => {
  const { type } = query;

  index.value = Number(type || 0);

  getTableData();

  nextTick(() => {
    getMenuItemTop();
  });
});

// 头部图片
const getImageUrl = (picture) => {
  const bkiFileTop = JSON.parse(picture || '[]');
  if (bkiFileTop.length) {
    return bkiFileTop[0].path;
  } else {
    return '';
  }
};

// 页面初次渲染完毕执行
onReady(() => {
  setTimeout(() => {
    swichMenu(Number(index.value));
  }, 1000);
});

// 获取右边菜单每个item到顶部的距离
const getMenuItemTop = () => {
  new Promise((resolve) => {
    const selectorQuery = uni.createSelectorQuery();
    selectorQuery
      .selectAll('.class-item')
      .boundingClientRect((rects: NodeInfo[]) => {
        // 如果节点尚未生成，rects值为[](因为用selectAll，所以返回的是数组)，循环调用执行
        if (!rects.length) {
          setTimeout(() => {
            getMenuItemTop();
          }, 10);
          return;
        }
        rects.forEach((rect) => {
          // 这里减去rects[0].top，是因为第一项顶部可能不是贴到导航栏(比如有个搜索框的情况)
          arr.value.push(rect.top - rects[0].top);
          resolve();
        });
      })
      .exec();
  });
};

// 右边栏目scroll-view的滚动条高度
const scrollRightTop = ref<number>(0);

// 点击左边的栏目切换
const swichMenu = async (index) => {
  if (arr.value.length === 0) {
    await getMenuItemTop();
  }
  if (index === current.value) return;
  scrollRightTop.value = oldScrollTop.value;
  await nextTick(() => {
    scrollRightTop.value = arr.value[index];
    current.value = index;
    leftMenuStatus(index);
  });
};

// 获取一个目标元素的高度
const getElRect = (elClass: string, dataVal?: Ref) => {
  new Promise((resolve) => {
    const query = uni.createSelectorQuery().in(instance);
    query
      .select('.' + elClass)
      .fields(
        {
          size: true
        },
        (res: NodeInfo) => {
          // 如果节点尚未生成，res值为null，循环调用执行
          if (!res) {
            setTimeout(() => {
              getElRect(elClass);
            }, 10);
            return;
          }
          if (dataVal) {
            dataVal.value = res.height;
          }
          resolve();
        }
      )
      .exec();
  });
};

// tab标题的滚动条位置
const scrollTop = ref<number | string>(0);

// 设置左边菜单的滚动状态
const leftMenuStatus = async (index) => {
  current.value = index;
  // 如果为0，意味着尚未初始化
  if (menuHeight.value === 0 || menuItemHeight.value === 0) {
    await getElRect('menu-scroll-view', menuHeight);
    await getElRect('u-tab-item', menuItemHeight);
  }

  // 将菜单活动item垂直居中
  scrollTop.value = index * menuItemHeight.value + menuItemHeight.value / 2 - menuHeight.value / 2;
};

// 右边菜单滚动
const rightScroll = async (e) => {
  oldScrollTop.value = e.detail.scrollTop;
  if (arr.value.length === 0) {
    await getMenuItemTop();
  }
  if (timer.value) return;
  if (!menuHeight.value) {
    await getElRect('menu-scroll-view', menuHeight);
  }
  setTimeout(() => {
    // 节流
    timer.value = null;
    // scrollHeight为右边菜单垂直中点位置
    const scrollHeight = e.detail.scrollTop + menuHeight.value / 2;
    for (let i = 0; i < arr.value.length; i++) {
      const height1 = arr.value[i];
      const height2 = arr.value[i + 1];
      // 如果不存在height2，意味着数据循环已经到了最后一个，设置左边菜单为最后一项即可
      if (!height2 || (scrollHeight >= height1 && scrollHeight < height2)) {
        leftMenuStatus(i);
        return;
      }
    }
  }, 10);
};

// 路由跳转
const routerPath = (id) => {
  uni.$u.route({
    url: '/pages/subscribe/projectDetails',
    params: {
      id
    }
  });
};

const bkiTypeDictText = ref('');
// 获取预约列表数据
const getTableData = () => {
  uni.showLoading({
    title: '加载中...',
    mask: true
  });
  $http.post({
    url: SUBSCRIBE.VENUE_LIST_INFORMATION,
    data: { bkiSiteName: bkiTypeDictText.value },
    success: (data) => {
      tabbar.value = data.map((item) => ({
        ...item,
        bookingSiteVos: item.bookingSiteVos || []
      }));
    },
    complete: () => {
      uni.hideLoading();
    }
  });
};
</script>

<style lang="scss" scoped>
.u-wrap {
  height: calc(100vh);
  /* #ifdef H5 */
  height: calc(100vh - var(--window-top));
  /* #endif */
  display: flex;
  flex-direction: column;
}

.u-search-box {
  padding: 18rpx 30rpx;
}

.u-menu-wrap {
  flex: 1;
  display: flex;
  overflow: hidden;
}

.u-search-inner {
  background-color: rgb(234, 234, 234);
  border-radius: 100rpx;
  display: flex;
  align-items: center;
  padding: 10rpx 16rpx;
}

.u-search-text {
  font-size: 26rpx;
  color: $u-tips-color;
  margin-left: 10rpx;
}

.u-tab-view {
  width: 200rpx;
  height: 100%;
}

.u-tab-item {
  height: 110rpx;
  background: #f6f6f6;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26rpx;
  color: #444;
  font-weight: 400;
  line-height: 1;
}

.u-tab-item-active {
  position: relative;
  color: $u-primary;
  font-size: 30rpx;
  font-weight: 600;
  background: #fff;
}

.u-tab-item-active::before {
  content: '';
  position: absolute;
  border-left: 3px solid $u-primary;
  height: 100%;
  left: 0;
}

.u-tab-view {
  height: 100%;
}

.right-box {
  background-color: rgb(250, 250, 250);
}

.page-view {
  padding: 16rpx;
}

.class-item {
  margin-bottom: 30rpx;
  background-color: #fff;
  padding: 16rpx;
  border-radius: 8rpx;
}

.class-item:last-child {
  min-height: 100vh;
}

.item-title {
  font-size: 26rpx;
  color: $u-main-color;
  font-weight: bold;
}

.item-menu-name {
  font-weight: normal;
  font-size: 24rpx;
  color: $u-main-color;
}

.item-container {
  display: flex;
  flex-wrap: wrap;
}

.thumb-box {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  margin-top: 20rpx;
}

:deep(.reserve-button) {
  width: 40rpx;
}

.item-menu-image {
  width: 120rpx;
  height: 120rpx;
  min-width: 120rpx;
}
</style>
